EP0285077A1 - Carburateur pour moteurs à combustion interne - Google Patents

Carburateur pour moteurs à combustion interne Download PDF

Info

Publication number
EP0285077A1
EP0285077A1 EP88105003A EP88105003A EP0285077A1 EP 0285077 A1 EP0285077 A1 EP 0285077A1 EP 88105003 A EP88105003 A EP 88105003A EP 88105003 A EP88105003 A EP 88105003A EP 0285077 A1 EP0285077 A1 EP 0285077A1
Authority
EP
European Patent Office
Prior art keywords
valve
carburetor
flat plate
disc
gate valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88105003A
Other languages
German (de)
English (en)
Other versions
EP0285077B1 (fr
Inventor
Pierluigi Dell'orto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dell Orto SpA
Original Assignee
Dell Orto SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dell Orto SpA filed Critical Dell Orto SpA
Priority to AT88105003T priority Critical patent/ATE95891T1/de
Publication of EP0285077A1 publication Critical patent/EP0285077A1/fr
Application granted granted Critical
Publication of EP0285077B1 publication Critical patent/EP0285077B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M9/00—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position
    • F02M9/02—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position having throttling valves, e.g. of piston shape, slidably arranged transversely to the passage
    • F02M9/06—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position having throttling valves, e.g. of piston shape, slidably arranged transversely to the passage with means for varying cross-sectional area of fuel spray nozzle dependent on throttle position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four

Definitions

  • the present invention concerns improvements in carburetors of the needle type with gate valve, for two-stroke or four-stroke internal combustion engines, especially for motorcycles.
  • gate valves for this type of carburetors have essentially been cylindrical and flat.
  • the cylindrical valves provide the considerable advantages of an improved distribution of the force transmitted by the spring closing the valve (and, thus, of an improved adjustment of the gas metering by the driver), and of an easier working (with conventional methods) of the mixing chamber (area of intersection between the main duct of the carburetor and the valve guide) and of the valve seat; but also the serious drawback that, as the mixture starts to come out of the full power jet - when the valve is slightly open - it may easily hit against the lower rim of the cylindrical body forming the valve itself, thereby causing dripping, condensation and, consequently, difficult and bad atomization; this fault then shows up most seriously (lack of progression) just when the best carburetion is required from the engine, that is, during pickup and sudden acceleration, and it is all the more emphasized the larger the duct of the carburetor and the diameter of the cylindrical valve.
  • the object of the present invention is to avoid the drawbacks of either types of valves, while preserving their advantages, that is, to realize a carburetor having a gate valve providing for a proper distribution of the force transmitted by the valve closing spring, providing for an easy and simple working of the metering chamber and of the valve seat, and allowing to prevent any hitting of the mixture jet - ­especially when the valve is only slightly open - against the walls of the actual valve (thus consequently preventing drippings, condensation and bad atomization of the mixture being fed to the engine).
  • said flat plate is formed of a pair of interconnected flat walls, the cylindrical wall disc and the flat plate projecting therefrom can form a single piece obtained by casting, and the inserted choke is also formed by casting.
  • these members or parts thereof can be of suitable synthetic plastic material.
  • the carburetor body is indicated by 1, its main duct by 2, the constant level float chamber by 3, the idling jet by 4 and the full-power diffuser by 5.
  • the carburetor is equipped with a gate valve 6 onto which act, for its opening, a control cable 7 controlled by the accelerator and, for its closing, a helical spring 8; to the valve 6 there is fixedly connected a needle 9 which penetrates in known manner into the full-power diffuser 5.
  • Reference CM indicates the carburetor mixing chamber, formed by the inserted choke 10 applied centrally into the carburetor body 1.
  • the gate valve 6 of the carburetor comprises a disc 11 with cylindrical wall 12, onto which bears (as onto a conventional cylindrical valve) the spring 8, and which slides (like a conventional cylindrical valve) into a corresponding cylindrical seat 13 of the carburetor, perpendicular to the main duct 2.
  • a flat plate 14 projecting diametrically and perpendicularly from its disc 11. Further- more, the end of the needle 9 connected to the valve 6 projects beyond said plate 14, centrally thereto.
  • the plate 14 is formed of two flat parallel walls 15 and 16, mutually connected by a central bridge 17 housing the needle 9, and fixedly connected to the disc 11.
  • the inserted choke 10 - formed separately, preferably by casting - ­ is inserted at the centre of the carburetor body 1, with which it forms the mixing chamber CM. It comprises ports 18, forming the duct 2, and two pairs of guide slots 19, into which are inserted and tightly slide the two flat walls 15 and 16 forming the plate 14 of the valve 6.
  • the disc 11, the walls 15 and 16, and the bridge 17 of the plate 14 of the valve 6, are formed in one piece by casting of metallic material.
  • the valve 6 could be differently obtained and could suitably comprise at least some parts of synthetic plastic material.
  • Even the inserted choke 10 could be made from synthetic plastic material.
  • the wall 15 of the plate 14 of the gate valve 6 comprises a known type recess 20, on the air inlet side, for forming the mixture.
  • the carburetor according to the invention provides all the advantages of those with cylindrical valve and of those with flat valve, without having their defects.
  • the arrangement of the invention in fact combines an efficient bearing of the valve closing spring and an easy working of the valve seat, typical of carburetors with cylindrical valve, with a good atomization in each working step, which is typical of carburetors with flat valve; moreover, without having to resort to a complicated working or having to face problems connected with valve closing, it is possible to prevent dripping and condensation of the mixture on the valve itself.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
EP88105003A 1987-04-02 1988-03-28 Carburateur pour moteurs à combustion interne Expired - Lifetime EP0285077B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88105003T ATE95891T1 (de) 1987-04-02 1988-03-28 Vergaser fuer brennkraftmaschinen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1994087 1987-04-02
IT19940/87A IT1203425B (it) 1987-04-02 1987-04-02 Carburatore per motori a combustione interna perfezionato

Publications (2)

Publication Number Publication Date
EP0285077A1 true EP0285077A1 (fr) 1988-10-05
EP0285077B1 EP0285077B1 (fr) 1993-10-13

Family

ID=11162511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88105003A Expired - Lifetime EP0285077B1 (fr) 1987-04-02 1988-03-28 Carburateur pour moteurs à combustion interne

Country Status (5)

Country Link
EP (1) EP0285077B1 (fr)
AT (1) ATE95891T1 (fr)
DE (1) DE3884837T2 (fr)
ES (1) ES2044994T3 (fr)
IT (1) IT1203425B (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB280028A (en) * 1926-10-28 1927-11-10 Brown & Barlow Ltd Improvements in or relating to carburettors for internal combustion engines
FR950064A (fr) * 1947-07-24 1949-09-16 Weber Spa E Dispositif d'étranglement du mélange pour carburateur et carburateur muni du dispositif même
DE1238719B (de) * 1959-04-07 1967-04-13 J Gurtner Sa Des Ets Kolbenschiebervergaser
DE2222104A1 (de) * 1971-06-10 1972-12-28 Ford Werke Ag Gemischansaugender,fremdgezuendeter Verbrennungsmotor
DE3019065A1 (de) * 1980-05-19 1981-11-26 William H. El Toro Calif. Edmonston Vergaser

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB280028A (en) * 1926-10-28 1927-11-10 Brown & Barlow Ltd Improvements in or relating to carburettors for internal combustion engines
FR950064A (fr) * 1947-07-24 1949-09-16 Weber Spa E Dispositif d'étranglement du mélange pour carburateur et carburateur muni du dispositif même
DE1238719B (de) * 1959-04-07 1967-04-13 J Gurtner Sa Des Ets Kolbenschiebervergaser
DE2222104A1 (de) * 1971-06-10 1972-12-28 Ford Werke Ag Gemischansaugender,fremdgezuendeter Verbrennungsmotor
DE3019065A1 (de) * 1980-05-19 1981-11-26 William H. El Toro Calif. Edmonston Vergaser

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 313 (M-437)[2036], 10th December 1985; & JP-A-60 147 560 (SUMITOMO BAKELITE K.K.) 03-08-1985 *

Also Published As

Publication number Publication date
DE3884837T2 (de) 1994-02-10
ES2044994T3 (es) 1994-01-16
IT8719940A0 (it) 1987-04-02
IT1203425B (it) 1989-02-15
EP0285077B1 (fr) 1993-10-13
ATE95891T1 (de) 1993-10-15
DE3884837D1 (de) 1993-11-18

Similar Documents

Publication Publication Date Title
US4308830A (en) Vane in the inlet passage of an internal combustion engine
US4131134A (en) Fluid flow regulator
US5586541A (en) Auxiliary assembly for improving the combustion efficiency of an engine
US5537979A (en) Mixture preparation device for double-feed engines
US4308829A (en) Vane in the inlet passage of an internal combustion engine
US4344406A (en) Fuel saver
US3214150A (en) Carburetor
EP0285077A1 (fr) Carburateur pour moteurs à combustion interne
US2987304A (en) Carburetor
US3943205A (en) Internal combustion engine
US4172437A (en) PCV flow regulator
US4000225A (en) Sonic flow variable area venturi carburetor
US4198358A (en) Carburetor with self adjusting double venturi
DE3314206C2 (de) Veränderbarer Venturivergaser
US12012920B2 (en) Charge forming device with throttle valve
US3893436A (en) Fuel supply system, carburetor for use in the same and method
US11802529B2 (en) Fuel and air charge forming device
JP2657691B2 (ja) 気化器
US4322376A (en) Carburetor
US4119685A (en) Variable venturi type carburetor
US4414948A (en) Apparatus for forming the operating mixture, in particular for mixture compressing internal combustion engines having externally supplied ignition
US1845710A (en) Carburetor
US5379739A (en) Carburetor
KR920000734Y1 (ko) 내연기관의 가변회전 벤튜리 기화기
CA1096253A (fr) Dispositif anti-pollution et economiseur d'essence helicoidal, en forme de pyramide tronquee utilise avec les carburateurs de moteurs a combustion interne

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB GR LI LU NL SE

17P Request for examination filed

Effective date: 19890314

17Q First examination report despatched

Effective date: 19900727

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE ES FR GB GR LI LU NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19931013

Ref country code: NL

Effective date: 19931013

Ref country code: LI

Effective date: 19931013

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19931013

Ref country code: CH

Effective date: 19931013

Ref country code: BE

Effective date: 19931013

Ref country code: AT

Effective date: 19931013

REF Corresponds to:

Ref document number: 95891

Country of ref document: AT

Date of ref document: 19931015

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3884837

Country of ref document: DE

Date of ref document: 19931118

ET Fr: translation filed
REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2044994

Country of ref document: ES

Kind code of ref document: T3

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19940328

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19940331

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19940328

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20020318

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20020326

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20020328

Year of fee payment: 15

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030329

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031001

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031127

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20030329